JP2005030363A - Motor-driven fan system for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lengthen the life of an electric motor in a motor-driven fan system for a vehicle, in which cooling air is circulated through a radiator 100 and a condenser 110 of an air conditioner for an automobile. <P>SOLUTION: This motor-driven fan system for a vehicle includes: a motor-driven blower 20 for circulating cooling air through the radiator 100 and the condenser 110 by a brushless motor 12; a motor-driven blower 20 for circulating cooling air through the radiator 100 and the condenser 110 by a motor 22 with a brush; and an electronic control device 40 for an engine, which operates only the motor-driven blower 10 when the temperature of the cooling water is determined to be under T2 on the basis of the detection output from a temperature sensor for detecting the temperature of the cooling water, and operates both of the motor-driven blowers 10, 20 when the temperature of the cooling water is determined to be T2 or higher. Thus, when the temperature of the cooling water does not become T2 or more, the motor-driven blower 20 will not be operated so that the availability factor of the motor 22 with a brush can be lowered and the life of the motor 22 with a brush can be lengthen. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electric fan system for a vehicle that generates cooling air using an electric blower.

  Conventionally, as an electric fan system for a vehicle, there are a radiator that cools engine cooling water, and an electric fan system that cools the radiator and the condenser by flowing cooling air toward the condenser (heat radiator) for vehicle air conditioning by an electric blower.

  For example, when this electric fan system for vehicles is applied to an automobile that is frequently used for an electric blower such as a taxi or a public car, an electric motor having a large rated capacity is adopted as the electric motor constituting the electric blower, and this By operating the electric motor with electric power smaller than the rated capacity, deterioration of the electric motor itself is minimized and the life of the electric motor is extended.

  However, in this case, adopting an electric motor having a large rated capacity may not only increase costs but also increase weight.

  In addition, although it is well known to extend the life of the electric motor by adopting a brushless motor as the electric motor of the electric blower, as shown in FIG. 8, in the vehicle width direction of the radiator (the vehicle left-right direction) If the size is larger than the size of the impeller of the electric blower in the width direction of the vehicle, only one electric blower will deteriorate the air distribution to the radiator, causing a portion that cannot send cooling air to the radiator. As a result, the cooling efficiency of the radiator is lowered, and as a result, fuel consumption is deteriorated.

  On the other hand, if two or more electric blowers using a brushless motor are adopted, the air distribution to the radiator can be made appropriate and cooling air can be sufficiently sent to the radiator, but the control for controlling the brushless motor. The circuit configuration becomes complicated, and when two or more electric blowers using a brushless motor are employed, a significant cost increase is caused.

  An object of the present invention is to provide a vehicular electric fan system that extends the life while suppressing an increase in cost.

  In order to achieve the above object, according to the present invention, in the first aspect of the present invention, a radiator (100) that cools cooling water that circulates in a water-cooled engine for running a vehicle, and a refrigerant that circulates in a refrigeration cycle apparatus. First electric blower (10) for circulating cooling air to a radiator and a radiator by a brushless motor (12) And the second electric blower (20) for circulating the cooling air to the radiator and radiator by the brushed motor (22), and the detection output from the temperature sensor for detecting the temperature of the cooling water, When it is determined that the temperature is lower than the predetermined value, only the first electric blower is operated, and when it is determined that the temperature of the cooling water is equal to or higher than the predetermined value, the first and second electric power transmissions are performed. Controller to operate both of the machine (40), characterized in that it comprises a.

  Thereby, if the cooling water temperature does not become a predetermined value or more, the second electric blower does not operate, the operating rate of the brushed motor can be reduced, and the consumption of the brushed motor can be reduced. For this reason, since the lifetime of the motor with a brush can be extended, the lifetime improvement of the 1st electric blower and by extension, the electric fan system for vehicles can be achieved.

  In addition, although a brushless motor is used as the first electric blower, a brushed motor is used as the second electric blower. Therefore, a brushless motor is used for both the first and second electric blowers. Compared with the case where it uses, the increase in cost can be suppressed. As described above, it is possible to extend the life while suppressing an increase in cost.

  In the invention according to claim 2, cooling air is supplied to the radiator (100) for cooling the cooling water circulating in the water-cooled engine for traveling the vehicle and the radiator (110) for cooling the refrigerant circulating in the refrigeration cycle apparatus. Electric fan system for a vehicle that circulates air and a radiator and a radiator with a brushless motor (12), and a radiator and a radiator with brushed cooling air Based on the detection output from the temperature sensor which detects the temperature of the 2nd electric blower (20) for circulating with a motor (22) and cooling water, it determined with the temperature increase rate of cooling water being less than predetermined value. When only the first electric blower is operated and it is determined that the temperature rise rate of the cooling water is equal to or higher than a predetermined value, both the first and second electric blowers are operated. Apparatus (40), characterized in that it comprises a.

  Thereby, if the rate of temperature increase of the cooling water does not become a predetermined value or more, the second electric blower does not operate, the operating rate of the brushed motor can be reduced, and the consumption of the brushed motor can be reduced. For this reason, since the lifetime of the motor with a brush can be extended, the lifetime improvement of the 1st electric blower and by extension, the electric fan system for vehicles can be achieved.

  Further, as in the first aspect of the invention, a brushless motor is used as the first electric blower, but a brush motor is used as the second electric blower. Compared with the case where a brushless motor is used for both of the electric blowers, an increase in cost can be suppressed.

  In the invention according to claim 3, cooling air is supplied to the radiator (100) for cooling the cooling water circulating in the water-cooled engine for traveling the vehicle and the radiator (110) for cooling the refrigerant circulating in the refrigeration cycle apparatus. Electric fan system for a vehicle that circulates air and a radiator and a radiator with a brushless motor (12), and a radiator and a radiator with brushed cooling air Based on the detection output from the second electric blower (20) to be circulated by the motor (22) and the pressure sensor for detecting the pressure of the refrigerant in the radiator, the pressure of the refrigerant is determined to be less than a predetermined value. When only the first electric blower is operated and it is determined that the pressure of the refrigerant is equal to or higher than a predetermined value, the control device that operates both the first and second electric blowers ( 0) and, characterized in that it comprises a.

  Thereby, if the pressure of a refrigerant | coolant does not become more than predetermined value, a 2nd electric blower will not operate, but the operating rate of a motor with a brush can be reduced and consumption of a motor with a brush can be reduced. For this reason, since the lifetime of the motor with a brush can be extended, the lifetime improvement of the 1st electric blower and by extension, the electric fan system for vehicles can be achieved.

  Further, as in the first aspect of the invention, a brushless motor is used as the first electric blower, but a brush motor is used as the second electric blower. Compared with the case where a brushless motor is used for both of the electric blowers, an increase in cost can be suppressed.

  In the invention according to claim 4, cooling air is supplied to the radiator (100) for cooling the cooling water circulating in the water-cooled engine for traveling the vehicle and the radiator (110) for cooling the refrigerant circulating in the refrigeration cycle apparatus. Electric fan system for a vehicle that circulates air and a radiator and a radiator with a brushless motor (12), and a radiator and a radiator with brushed cooling air Based on the detection output from the second electric blower (20) to be circulated by the motor (22) and the pressure sensor for detecting the pressure of the refrigerant in the radiator, the rate of increase in the refrigerant pressure is less than a predetermined value. When it is determined that only the first electric blower is operated, and when it is determined that the pressure increase rate of the refrigerant is equal to or greater than a predetermined value, both the first and second electric blowers are operated. That the control unit (40), characterized in that it comprises a.

  Thereby, if the pressure increase rate of a refrigerant | coolant does not become more than predetermined value, a 2nd electric blower will not operate | move, but the operating rate of a motor with a brush can be reduced and consumption of a motor with a brush can be reduced. For this reason, since the lifetime of the motor with a brush can be extended, the lifetime improvement of the 1st electric blower and by extension, the electric fan system for vehicles can be achieved.

  Further, as in the first aspect of the invention, a brushless motor is used as the first electric blower, but a brush motor is used as the second electric blower. Compared with the case where a brushless motor is used for both of the electric blowers, an increase in cost can be suppressed.

  In the invention according to claim 5, the controller (40) is configured such that the temperature of the cooling water detected by the temperature sensor is equal to or higher than a predetermined value, and the vehicle speed detected by the vehicle speed sensor for detecting the speed of the vehicle. When it is determined that the value exceeds a certain value, only the first electric blower is operated.

  Furthermore, in the invention according to claim 6, the control device (40) is configured such that the pressure of the refrigerant in the radiator is not less than a predetermined value and the vehicle speed detected by the vehicle speed sensor for detecting the vehicle speed is a certain value. When it determines with the above, it is characterized by operating only the 1st electric blower.

  According to the fifth and sixth aspects of the present invention, if the vehicle speed is equal to or higher than a certain speed, the heat exchanger can be cooled by the wind speed of the vehicle, and sufficient cooling capacity can be achieved without operating the brushed motor. Can be secured.

  Incidentally, the reference numerals in parentheses of each means described above are an example showing the correspondence with specific means described in an embodiment described later.

(First embodiment)
The structure of the electric fan system for vehicles which is one Embodiment which concerns on FIGS. 1-4 at this invention is shown. 1 and 2 are diagrams illustrating a schematic configuration of an electric fan system for a vehicle.

  The electric fan system for vehicles includes electric blowers 10 and 20 as shown in FIG. 1 in the engine room of the automobile. The electric blower 10 includes an impeller 11 and a brushless motor 12 that rotationally drives the impeller 11. The electric blower 20 includes an impeller 21 and a brushed motor (DC motor) that rotationally drives the impeller 21. ) 22.

  Here, the electric blowers 10 and 20 serve to cool the radiator 100 and the condenser 110 by passing cooling air through the radiator 100 and the condenser 110.

  Radiator 100 and capacitor 110 are arranged in the vehicle front-rear direction in the engine room. The radiator 100 cools cooling water (engine cooling water) circulating in the water-cooled engine for traveling the vehicle. The condenser 110 is a constituent element of an automobile air conditioner (refrigeration cycle apparatus) that air-conditions the passenger compartment in the refrigeration cycle, and cools the refrigerant circulating in the automobile air conditioner.

Next, a schematic electrical configuration of the vehicle electric fan system of the present embodiment will be described with reference to FIGS.
FIG. 3 is a block diagram showing an electrical schematic configuration of the electric fan system for a vehicle, and FIG. 4 is a block diagram showing details of the electric fan drive circuit in FIG.

  As shown in FIG. 3, the vehicle electric fan system includes an electric fan drive circuit 30 and an engine electronic control unit (E / G-ECU) 40, and the electric fan drive circuit 30 is shown in FIG. 4. As shown in FIG. 4, the control unit 31 includes a brush motor driver 32 and a brushless motor driver 33.

  The control unit 31 includes a brushless motor control unit 31a, an energization logic generation circuit 31b, and a brushed motor control unit 31c.

  Here, the brushless motor control unit 31 a detects the actual position of the rotor 12 b of the brushless motor 12 based on the detection output by the magnetic pole sensor 13 in the brushless motor 12. The detected actual position of the rotor 12b is hereinafter referred to as a detected position of the rotor 12b.

  The magnetic pole sensor 13 is composed of three Hall elements, and the magnetic pole sensor 13 is disposed around the rotor 12b in the brushless motor 12 and detects a change in the magnetic field accompanying the rotation of the rotor 12b. The rotor 12b is made of a permanent magnet, and rotates the impeller 11 by its rotation.

  The brushless motor control unit 31a detects the target rotational speed of the brushless motor 12 as a control command value (brushless control command value) based on the duty ratio Ds of the pulse signal sent from the engine electronic control device 40.

  Then, the energization logic generation circuit 31b drives the brushless motor driver 33 based on the detection position of the rotor 12b so that the actual rotational speed of the brushless motor 12 approaches the target rotational speed.

  The brushless motor driver 33 is a known inverter circuit that controls the three-phase AC power supplied from the DC power supply Ba and supplied to the stator coil 12a of the brushless motor 12, and includes six field effect transistors U +, A three-phase full-wave bridge circuit is configured using V +, W +, U-, V-, and W-.

  The brushed motor control unit 31c performs PWM (Pulse Width Modulation) control of the brushed motor driver 32 in accordance with a control signal (brushed motor control command value) from the engine electronic control unit 40. The brushed motor driver 33 is composed of a single field effect transistor, and is supplied with power from the DC power supply Ba to control the amount of current supplied to the brushed motor 22.

  The engine electronic control unit 40 is composed of a microcomputer, a memory, and the like, and includes a detection output of a temperature sensor that detects the temperature of the coolant of the traveling engine, and a pressure that detects the pressure of the refrigerant flowing in the condenser 110. The electric blowers 10 and 20 are controlled through the electric fan drive circuit 30 based on the detection output of the sensor. The temperature sensor detects the temperature of the cooling water that flows out of the radiator 100 and returns to the water-cooled engine.

  Next, the operation of this embodiment will be described with reference to FIGS. FIG. 5 is a flowchart showing the blower control process by the engine electronic control unit 40. The engine electronic control unit 40 executes the computer program stored in the memory according to the flowchart shown in FIG. This computer program is repeatedly executed.

  First, in step S100, the temperature of the cooling water from the water temperature sensor (hereinafter referred to as water temperature Tw) and the refrigerant pressure Pc from the pressure sensor are read. Next, in step S110, the first and second duty ratios D1 and D2 of the pulse signal for controlling the electric blower 10 are stored in the memory in advance with the water temperature Tw, the pressure Pc, and the characteristics shown in FIGS. Based on the figure (S110).

  Specifically, as the first duty ratio D1, as shown in FIG. 6, a larger value is selected as the water temperature Tw increases from the temperature T1 to the temperature T2 (> T1). As the second duty ratio D2, as shown in FIG. 7, a larger value is selected as the pressure Pc increases from the pressure P1 to the pressure P2 (> P1). Here, the first and second duty ratios D <b> 1 and D <b> 2 are values indicating the number of rotations of the electric blower 10, that is, the amount of blown air.

  Next, the larger one of the first and second duty ratios D1 and D2 determined from the cooling water temperature and the refrigerant pressure is selected (S120), and the pulse signal of the selected duty ratio Ds is selected. It outputs to the brushless motor control part 31a of the control part 31 of the electric fan drive circuit 30.

  Here, the brushless motor control unit 31a detects the target rotational speed based on the duty ratio Ds of the pulse signal, detects the detection position of the rotor 12b based on the detection output from the magnetic pole sensor 13, and detects the rotor 12b. A drive signal including the position and the target rotational speed is generated and output to the energization logic generation circuit 31b.

  Accordingly, the energization logic generation circuit 31b is a transistor that constitutes the brushless motor driver 33 so that the actual rotation speed of the brushless motor 12 is brought close to the target rotation speed based on the drive signal from the brushless motor control section 31a. U +, V +, W +, U−, V− and W− are individually switched.

  These transistors U +, V +, W +, U-, V-, W- supply three-phase AC power to the stator coil 12a by individual switching. Of the transistors U +, V +, W +, U-, V-, and W-, the low potential side transistors U-, V-, and W- are PWM-controlled based on the control by the energization logic generation circuit 31b. Be controlled.

  Along with this, the rotational speed of the rotor 12b, and consequently the rotational speed of the impeller 11, is controlled by controlling the amount of three-phase AC power supplied to the stator coil 12a. Thereby, the rotation speed of the impeller 11 is controlled based on the duty ratio Ds of the pulse signal.

  That is, as the electric blower 10, it is possible to allow the cooling air of the blowing amount determined according to the detection signals Tw and Pc to pass through the radiator 100 and the capacitor 110.

  Next, based on the detection signal Tw output from the temperature sensor, when it is determined that the temperature of the cooling water is equal to or higher than T2 (for example, 105 ° C.), a pulse signal having a predetermined duty ratio is determined by the control unit 31. To the motor controller with brush 31c (S140, S150).

  Accordingly, when the brushed motor control unit 31c controls the brushed motor driver 32, the brushed motor driver 33 rotates the brushed motor 22 at a constant rotational speed. In this case, as the electric blower 20, a constant amount of cooling air is passed through the radiator 100 and the condenser 110.

  Thus, the electric blower 20 can pass cooling air through the radiator 100 and the condenser 110 together with the electric blower 10.

  Further, when the engine electronic control unit 40 determines that the coolant temperature Tw is lower than T2 based on the detection signal output from the temperature sensor, the engine electronic control unit 40 performs a pulse on the brushed motor control unit 31c of the control unit 31. No signal is output, and only the electric blower 10 allows the cooling air to flow through the radiator 100 and the condenser 110.

  Hereinafter, the operational effects of this embodiment will be described.

  According to the present embodiment, since the electric blower 20 does not operate unless the temperature of the cooling water becomes equal to or higher than T2, the operating rate of the brushed motor 22 (the operating time of the motor with respect to a certain time) decreases, and the brush The consumption of the attached motor 22 can be reduced. For this reason, since the lifetime of the motor 22 with a brush can be extended, the lifetime improvement of the electric blower 20 and by extension, the electric fan system for vehicles can be achieved.

  Moreover, although the brushless motor 12 is used as the electric blower 10, the brushless motor 12 is used for both the electric blowers 10 and 20 because the brushed motor 22 is used as the electric blower 20. As compared with the above, the configuration of the electric fan drive circuit can be simplified, and the increase in cost can be suppressed.

(Second Embodiment)
In the first embodiment described above, the example in which the brushed motor 22 is operated in addition to the brushless motor 12 only when the temperature of the cooling water is determined to be equal to or higher than the predetermined value has been described. The brushed motor 22 may be operated in addition to the brushless motor 12 only when it is determined that the temperature rise rate of the cooling water is equal to or greater than a predetermined value.

  Specifically, an electric fan system for a vehicle that circulates cooling air through a radiator 100 that cools cooling water that circulates in a water-cooled engine for driving the vehicle, and a condenser 110 that cools refrigerant that circulates in the air conditioner for an automobile. An electric blower 10 for circulating cooling air to the radiator 100 and the condenser 110 by the brushless motor 12, an electric blower 20 for circulating cooling air to the radiator 100 and the condenser 110 by the brushed motor 22, and cooling Based on the detection output from the temperature sensor that detects the temperature of the water, when it is determined that the temperature increase rate of the cooling water is less than a certain value, only the electric blower 10 is operated and the temperature increase rate of the cooling water is a constant value. When it determines with it being the above, the electronic controller for engines which operates both the electric blowers 10 and 20 0 and a.

  Here, the temperature increase rate is a value indicating a temperature range (ΔH) (= post-measurement temperature Ha−pre-measurement temperature Hb) that has risen in a certain time as the temperature rises.

  Alternatively, the following (1) and (2) may be used instead.

  (1) In the electric fan system for a vehicle in this case, cooling air is supplied to the radiator 100 that cools the cooling water that circulates in the water-cooled engine for traveling the vehicle, and the condenser 110 that cools the refrigerant that circulates in the automobile air conditioner. An electric fan system for a vehicle that distributes cooling air to the radiator 100 and the condenser 110 by the brushless motor 12, and an electric fan 10 that distributes the cooling air to the radiator 100 and the condenser 110 by the brushed motor 22. When it is determined that the pressure of the refrigerant is less than a predetermined value based on the detection output from the electric blower 20 and the pressure sensor that detects the pressure of the refrigerant in the capacitor 110, only the electric blower 20 is operated and the refrigerant When it is determined that the pressure of the electric blower is equal to or higher than the predetermined value, An engine electronic control unit 40 to operate, and characterized in that it comprises a.

  (2) In the electric fan system for a vehicle in this case, cooling air is supplied to the radiator 100 that cools the cooling water that circulates in the water-cooled engine for traveling the vehicle, and the condenser 110 that cools the refrigerant that circulates in the automobile air conditioner. An electric fan system for a vehicle that distributes cooling air to the radiator 100 and the condenser 110 by the brushless motor 12, and an electric fan 10 that distributes the cooling air to the radiator 100 and the condenser 110 by the brushed motor 22. When it is determined that the rate of increase in the refrigerant pressure is less than a predetermined value based on the detection output from the electric blower 20 and the pressure sensor that detects the pressure of the refrigerant in the capacitor 110, only the electric blower 10 is operated. When the pressure increase rate of the refrigerant is determined to be greater than or equal to a predetermined value, the electric blower An engine electronic control unit 40 to operate both 0,20, characterized in that it comprises a.

  Here, the pressure increase rate is a value indicating a pressure width (ΔP) (= post-measurement temperature Pa−pre-measurement temperature Pb) that is increased for a certain time when the pressure is increased.

  In the above-described embodiment, the example in which the brushless motor 12 and the brushed motor 22 are used one by one has been described. However, the number of the brushless motors 12 may be two or more.

(Third embodiment)
In the above-described embodiment, when it is determined that the temperature (or temperature increase rate) of the cooling water is equal to or higher than a predetermined value, or when it is determined that the refrigerant pressure (or pressure increase rate) of the condenser is equal to or higher than a predetermined value, Although an example in which the brushed motor 22 is operated in addition to the brushless motor 12 has been described, the brushed motor 22 may be turned off even under such conditions as long as the vehicle traveling speed is equal to or higher than a predetermined speed. .

  Hereinafter, the operation of the present embodiment will be described with reference to FIG. In addition, about the operation | movement similar to 1st Embodiment, the same code | symbol is attached | subjected and detailed description is abbreviate | omitted.

  That is, in step S100A, in addition to the water temperature Tw and the pressure Pc, the detected vehicle speed V is read from the vehicle speed sensor that detects the vehicle speed. Next, a duty ratio determination process (S110), a duty ratio selection process (S120), and a brushless fan drive process (S130) are executed, and the process proceeds to S140.

  If it is determined in S140 that the temperature of the cooling water is equal to or higher than T2 (eg, 105 ° C.), the process proceeds to S141. If it is determined in S141 that the running speed of the vehicle is, for example, less than 15 km, a pulse signal having a predetermined duty ratio is output to the brushed motor control unit 31c of the control unit 31 (S150).

  Accordingly, when the brushed motor control unit 31c controls the brushed motor driver 32, the brushed motor driver 33 rotates the brushed motor 22 at a constant rotational speed. In this case, as the electric blower 20, a constant amount of cooling air is passed through the radiator 100 and the condenser 110.

  Thus, the electric blower 20 can pass cooling air through the radiator 100 and the condenser 110 together with the electric blower 10.

  On the other hand, in S141, when it is determined that the vehicle speed is 15 km / h or higher, no pulse signal is output to the brushed motor control unit 31c of the control unit 31, and only the electric blower 10 supplies the cooling air to the radiator 100 and The condenser 110 is ventilated.

  According to the present embodiment, if the vehicle speed is 15 km / h or higher, the radiator 100 and the condenser 110 can be cooled by the vehicle speed wind, and sufficient cooling air can be secured without operating the brushed motor 22. be able to. Therefore, the consumption of the brushed motor 22 can be further reduced as compared with the embodiment described above.

  In the above-described embodiment, the example in which the brushed motor 22 is rotationally driven at a constant rotational speed when the temperature of the cooling water is equal to or higher than T2 has been described. Depending on one of the pressure and the temperature of the cooling water, the rotational speed of the brushed motor 22 may be changed to change the air flow rate.

It is a figure showing the outline of the electric fan system for vehicles of one embodiment of the present invention. It is a figure which shows arrangement | positioning of the radiator and capacitor | condenser which concern on the electric fan system for vehicles of FIG. It is a figure which shows the electrical schematic structure of the electric fan system for vehicles of FIG. It is a figure which shows the electrical structure of the electric fan drive circuit of the electric fan system for vehicles of FIG. It is a flowchart which shows the process of the electronic controller for engines of FIG. It is a figure for demonstrating the action | operation of the engine electronic control apparatus of FIG. It is a figure for demonstrating the action | operation of the engine electronic control apparatus of FIG. It is a figure which shows the outline of the electric fan system for vehicles in a prior art. It is a flowchart which shows the process of the electronic controller for engines in 3rd Embodiment.

Explanation of symbols

10, 20 ... Electric blower, 11, 21 ... Impeller,
12 ... Brushless motor, 13 ... Rotation speed sensor,
12b ... permanent magnet, 22 ... motor with brush,
30 ... Electric fan drive circuit, 40 ... Electronic controller for engine,
31 ... Control unit, 32 ... Brush motor driver,
33 ... Brushless motor driver, 31a ... Brushless motor controller,
31b ... energization logic generation circuit, 31c ... motor controller with brush,
100: Radiator, 110: Capacitor.

Claims (6)

An electric fan system for a vehicle that distributes cooling air to a radiator (100) that cools cooling water that circulates in a water-cooled engine for vehicle travel and a radiator (110) that cools refrigerant that circulates in a refrigeration cycle apparatus. There,
A first electric blower (10) for circulating cooling air to the radiator and the radiator by a brushless motor (12);
A second electric blower (20) for circulating cooling air to the radiator and the radiator by a brushed motor (22);
Based on the detection output from the temperature sensor that detects the temperature of the cooling water, when it is determined that the temperature of the cooling water is less than a predetermined value, only the first electric blower is operated, and the temperature of the cooling water And a control device (40) for operating both the first and second electric blowers when it is determined that is equal to or greater than a predetermined value. An electric fan system for a vehicle that distributes cooling air to a radiator (100) that cools cooling water that circulates in a water-cooled engine for vehicle travel and a radiator (110) that cools refrigerant that circulates in a refrigeration cycle apparatus. There,
A first electric blower (10) for circulating cooling air to the radiator and the radiator by a brushless motor (12);
A second electric blower (20) for circulating cooling air to the radiator and the radiator by a brushed motor (22);
When it is determined that the temperature increase rate of the cooling water is less than a predetermined value based on the detection output from the temperature sensor that detects the temperature of the cooling water, only the first electric blower is operated, And a control device (40) for operating both of the first and second electric blowers when it is determined that the temperature increase rate of the motor is greater than or equal to a predetermined value. An electric fan system for a vehicle that distributes cooling air to a radiator (100) that cools cooling water that circulates in a water-cooled engine for vehicle travel and a radiator (110) that cools refrigerant that circulates in a refrigeration cycle apparatus. There,
A first electric blower (10) for circulating cooling air to the radiator and the radiator by a brushless motor (12);
A second electric blower (20) for circulating cooling air to the radiator and the radiator by a brushed motor (22);
When it is determined that the pressure of the refrigerant is less than a predetermined value based on a detection output from a pressure sensor that detects the pressure of the refrigerant in the radiator, only the first electric blower is operated, and the radiator And a control device (40) for operating both the first and second electric blowers when it is determined that the pressure of the refrigerant is equal to or higher than a predetermined value. . An electric fan system for a vehicle that distributes cooling air to a radiator (100) that cools cooling water that circulates in a water-cooled engine for vehicle travel and a radiator (110) that cools refrigerant that circulates in a refrigeration cycle apparatus. There,
A first electric blower (10) for circulating cooling air to the radiator and the radiator by a brushless motor (12);
A second electric blower (20) for circulating cooling air to the radiator and the radiator by a brushed motor (22);
Based on the detection output from the pressure sensor that detects the pressure of the refrigerant in the radiator, when it is determined that the rate of increase of the pressure of the refrigerant is less than a predetermined value, only the first electric blower is operated, A vehicle electric fan system comprising: a control device (40) that operates both the first and second electric blowers when it is determined that the pressure increase rate of the refrigerant is equal to or greater than a predetermined value. . When the control device (40) determines that the temperature of the cooling water detected by the temperature sensor is equal to or higher than a predetermined value and the vehicle speed detected by a vehicle speed sensor that detects the speed of the vehicle is equal to or higher than a certain value. The vehicle electric fan system according to claim 1, wherein only the first electric blower is operated. When the control device (40) determines that the pressure of the refrigerant in the radiator is equal to or greater than a predetermined value and the vehicle speed detected by a vehicle speed sensor that detects the vehicle speed is equal to or greater than a certain value, 4. The vehicle electric fan system according to claim 3, wherein only one electric blower is operated.

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